My prediction on this season (Season 4)

First part (episodes 1-12) will be about Music Festival and chapters after it and end on chapter 180

Second part (episodes 13-24) will be about next arc and will end either on chapter 199, chapter 203 or, if they will go completely crazy with us because pacing was amazing this episode (3 chapters!) on chapter 213

We will get at least 1 opening and 1 ending more this season, because this opening have zero references to events of 180-XXX, but we know they should be because of some characters from ED1